Megan Fox has caused a stir with her latest ad for Giorgio Armani.Megan Fox, the American model and actress, appears in a provocative new ad for Giorgio Armani, reports the Examiner.Fox has taken over from Victoria Beckham as the spokeswoman for Emporio Armani underwear and is also the face of the company's latest fragrance 'Code'. It has been reported that Beckham was scheduled to represent the brand until 2012 but her latest pregnancy has paved the way for Fox's arrival. In the new ad, the 'Transformers' actress dons an ebony bob style wig, a black dress and ruby coloured lips. The revealing shoot highlights Fox's toned figure as well as her numerous tattoos. The 24-year-old's recent campaign for Armani Jeans began gracing billboards in Milan, Tokyo and New York in February 2011. When asked why the actress was chosen to represent the fashion house, Giorgio Armani said, "Megan is young and sexy and has a lot of spirit", adding that his brands are "all about a youthful attitude, making her the perfect choice for the collections".Megan Fox is currently filming the comedy movie 'Friends with Kids', starring Jon Hamm and Adam Scott. The film, directed by Jennifer Westfeldt, follows the story of two best friends who have a child together but decide to date other people in an attempt to avoid the stress of being a romantic couple.